<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>display a map</title>
    <meta
      name="viewport"
      content="initial-scale=1,maximum-scale=1,user-scalable=no"
    />
    <script src="../../lib/mapbox-gl.js"></script>
    <link href="../../lib/mapbox-gl.css" rel="stylesheet" />
    <script src="../../lib/axios.min.js"></script>
    <style>
      body {
        margin: 0;
        padding: 0;
      }
      #map {
        position: absolute;
        top: 0;
        bottom: 0;
        width: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      let baseDataUrl = `http://${localStorage.getItem(
        "host"
      )}/mapbox-gl-js-offline-examples`;
      axios
        .get(
          baseDataUrl +
            `/resources/styles/${localStorage.getItem(
              "mbtilesStylesName"
            )}.json`
        )
        .then((res) => {
          let data = res.data;
          initMap(data);
        })
        .catch((err) => {
          console.error(err);
        });

      function initMap(style) {
        let map = new mapboxgl.Map({
          container: "map",
          center: [103.463, 33.415],
          zoom: 3,
          style: style,
        });

        var radius = 20;

        function pointOnCircle(angle) {
          return {
            type: "Point",
            coordinates: [
              Math.cos(angle) * radius + 103.463,
              Math.sin(angle) * radius + 33.415,
            ],
          };
        }

        map.on("load", function () {
          // Add a source and layer displaying a point which will be animated in a circle.
          map.addSource("point", {
            type: "geojson",
            data: pointOnCircle(0),
          });

          map.addLayer({
            id: "point",
            source: "point",
            type: "circle",
            paint: {
              "circle-radius": 10,
              "circle-color": "#007cbf",
            },
          });

          function animateMarker(timestamp) {
            // Update the data to a new position based on the animation timestamp. The
            // divisor in the expression `timestamp / 1000` controls the animation speed.
            map.getSource("point").setData(pointOnCircle(timestamp / 1000));

            // Request the next frame of the animation.
            requestAnimationFrame(animateMarker);
          }

          // Start the animation.
          animateMarker(0);
        });
      }
    </script>
  </body>
</html>
